It's way too early to charge anyones card in april for mays subscriptions. They can only do that 5 calendar days before sale day. They have to send out subscription renewals first.
From the mattycollector website:
May MOTUC Subscription Key Dates
Here are the important dates to note for May 2012: Your card will be charged 5 calendar days before the on-sale date, so plan to have funds available before Thursday, May 10th. Subscription orders will begin shipping approximately Friday, May 11th, 2012, about two business days before the on-sale date. These dates apply to Club EterniaŽ, DC Universe Club Infinite Earths, and MOTU 30th Anniversary Series.
Again, if you need to change your billing information, shipping address, or email address please call 1-877-GO-MATTY by May 6th. And if for any reason your subscription has been cancelled, please call to get reinstated and you'll receive the May figure(s).
Remember, the sale starts Tuesday, May 15th at 9 a.m. PT (12 noon ET).